Roll-type air filter



A. E. REVELL Nov. 7, 1967 ROLL-TYPE AIR FILTER 2 Sheets-Sheet 1 Filed Jan. 21, 1965 Fig.

INVENTOR 4/570 E @e ve// ATTORNEY Nov. 7, 1967 A. E. REVELL 3,350,853

7 ROLL-TYPE AIR FILTER Filed Jan. 21, 1965 2 Sheets-Sheet 2 IN VEN TOR.

BY I mm 5. 2M

@ ,&&@u;%

3,350,853 ROLL-TYPE AIR FILTER Alan E. Revell, Louisville, Ky., assignor to American Air Filter Company, Inc., Louisville, Ky., a corporation of Delaware Filed Jan. 21, 1965, Ser. No. 426,865 4 Claims. (Cl. 55-354) ABSTRACT OF THE DISCLOSURE An improved roll storage section in a filter assembly wherein the storage section includes at least two roll insertion paths and at least one opening to each path through which a filter medium roll can be selectively inserted, a filter roll manipulating means in said storage section and means to permit removal of the manipulating means from the roll insertion paths during insertion or removal of a roll.

The present invention relates to roll-type filters and more particularly to an improved roll support zone construction in roll-type filters wherein filter material is passed from a supported position in a supply zone through a fluid-treating zone to a supported position in a rewind zone.

In accordance with the present inventioman economical and straightforward arrangement is provided for loading and manipulating roll-type filter material with a minimum of operational steps and with a minimum of structure. In addition, the present invention provides: a structure which permits selective insertion and withdrawal of a roll of filter material to and from a filter zone having more than one roll insertion opening without interference from the manipulating arrangement for the roll of filter material. Further, the roll support arrangement of the present invention provides improved means for indicating media run-out and improved means for holding the media down in the filter media rewind zone.

Various other features of .the present invention will become obvious to one skilled in the art upon reading the disclosure set forth herein.

More particularly, the present invention provides, in a roll-type filter, an improved zone construction for manipulating a roll of filter material wound upon a mandrel having projecting spindles comprising: a housing having a roll support zone including two opposed end walls and at least two roll insertion openings through which the filter roll can be selectively inserted; bearing means to receive and support the spindles in the roll support zone with the roll therebetween when the roll is in operative position; filter roll manipulating means pivotally mounted in the roll support zone at a position pivotally removable from the path of the filter roll during filter roll loading operations with respect to any preselected roll insertion opening; and spring means connected to the filter roll manipulating means to urge the manipulating means into abutting engagement against a filter'roll when a roll has been inserted into operative position in this zone.

It is to be understood that various changes can be made in the arrangement, form and construction of the apparatus disclosed herein without departing from the scope or spirit of the present invention.

Referring to the drawings which disclose one advantageous embodiment of the present invention:

FIGURE 1 is a perspective front view of a roll-type filter disclosing a roll supply zone with an inventive manipulating arrangement for a roll of filter material incorporated therein, the filter material roll being disclosed in phantom; r

3,350,853 Patented Nov. 7, 1967 FIGURE 2 is an enlarged perspective view of the filter roll manipulating structure of FIGURE 1;

FIGURE 3 is a perspective view of a filter material roll which can be used in the present invention;

FIGURE 4 is a schematic wiring diagram which can be ercriigloyed with the manipulating structureot FIGURES FIGURE 5 is a perspective rear view of a roll-type filter disclosing the roll rewind zone into which an improved manipulating structure can be incorporated; and

FIGURE 6 is an enlarged perspective view of the manipulating structure employed with the rewind .zone arrangement of FIGURE 5.

Referring to FIGURE 1 of the drawings, a roll-type filter housing 2 is disclosed, this housing including roll support supply zone 3, filter zone 4, and roll support rewind zone 6. Supply zone 3 serves to receive and support a roll of filter material 7, disclosed in FIGURE 1 of the drawings in phantom line form, and in FIGURE 3 of the drawings in solid line form. Roll 7 can be comprised of a web of suitable filter medium material such as fiberglass. Advantageously, it can be in compressed condition on roll 7 in the supply zone 3 to be expanded from. the roll in filter zone 4 and compressed again in rewind zone 6. This Web is progressively advanced through zone 4 which frames a fluid stream passage through which the fluid to be treated must flow. The contaminant loaded Web 7 is then progressively advanced to rewind zone 6 where it is wound onto a discharge roll 8 which ultimately can be thrown away or reconditioned. A suitable drive motor and web metering controls, known in the art and not descridbed in detail, can be utilized to advance the medium progressively in the manner aforedescribed. This drive motor and web metering control equipment is positioned in housing 2 adjacent roll support rewind zone 6 and is broadly referred to herein by reference numeral 9. a

The clean roll of filter material 7, as well as discharg roll '8, is wound upon a mandrel 11 which has opposite end rims 12 and opposite projecting spindles 13, the spindles 13 being of preselected cross-sectional contour to nest with slots in the bearing units of the roll support zone. It is tojbe understood that the mandrel and end rims can be made from any one of a number of suitable materials and advantageously, a lightweight strong metal can be used.

Before proceeding with further details of the description of the invention, it is to be noted that supplyzone 3 and rewind zone 6 are each provided with several roll insertion openings for preselected alternative loading operations of the filter material rolls 7 and 8 into and out of the zones 3 and 6 respectively.

As can be seen in FIGURES 1 to 4 of the drawings, roll support supply zone 3 is provided with a novel roll manipulating construction in the form of a filter mechanism run-out switch assembly, herein broadly designated by reference numeral 14. Switch assembly 14 includes button switch, 16 positioned intermediate the front and rear openings of supply zone 3 so-as to be opposite the' end opening of zone 3 and falling substantially within or adjacent a plane determined by the axes of roll rotation in the filter roll support zones 3 and 6.

Button switch 16 which is incorporated as part of media movement control and indicating circuit 20 (FIGURE 4) is arranged to be selectively actuated by switch arm 18. Arm 18 is pivotally mounted in zone 3 by means of hinge 19, one plate 21 of which is fixed to housing 2 adjacent button switch 16, and the other plate 22 of which is movable about pintle 23, the end of arm 18 being fixed to plate 22 by means of screw 24-. It is to be noted that movable hinge plate 22 is provided with an adjusting nut and screw arnangement 26 which serves to permit adjustments for actuating button switch 16 at preselected run-outs of filter material on roll 7. It further is to be noted that movable plate 22 is provided with an extension arm 27, this extension arm serving to receive one end of helical, longitudinally-extending spring 28, the other end of spring 28 being fastened to housing 2.

With the arrangement aforedescribed, it is possible for arm 18 to be pivotally removed from the loading path of all of the roll insertion openings with the longitudinal axis of spring 2-8 shifting over the pivot axis 23 of arm 18 to urge arm 18 away from the filter roll path through the various openings. In this connection it is to be noted that arm 18 is of sufiicient length to extend through the last of the roll openings from which the arm has been pivotally removed so as to be actuated toward abutting engagement against filter roll 7 when door 31 of the last opening is closed.

As can be seen in FIGURE 4 of the drawing, when arm 18 moves sufficiently far inwardly due to run-out of the media on filter roll 7, button switch 16 is actuated. This button switch 16 is part of motor control circuit 20 as disclosed in FIGURE 4. When button 16 is closed, solenoid 32 connected across line L -L is actuated. This, in turn, causes normally-open contact 32(0) to close so that the indicating light 33 in the circuit is caused to go on to advise maintenance personnel that the filter roll has run out. At the same time, the normally-closed contact 32(c) in the circuit is caused to open and rewind motor controls 9 are shut off.

Referring to FIGURES and 6, the manipulating control for a roll of filter material 8 is disclosed including the inventive concept in the form of media hold-down bar 36. This media hold-down bar is pivotally positioned on spaced pivot pin assemblies 37 at one corner of rewind zone 6. In this connection it is to be noted that the pivotal arrangement disclosed is such as to permit bar 36 to be moved out of the path of the filter roll 8 during loading operations when roll 8 is inserted or removed from rewind zone 6. To urge bar 36 into tight engagement against media roll 8, a pair of spaced helical longitudinally-extending springs 38 are each slideably fastened at corresponding ends to spaced loop members 39 on bar 36. It is to be noted that loop members 39' are positioned adjacent pivot pin assemblies 37 of the bar 36. The other corresponding ends of helical springs 38 are fixed to housing member 2. In this connection, it also is to be noted that helical springs 38 can be of a heavy-duty type to firmly urge bar 36 against media roll 8 to compress the media as it is wound onto the roll. Further, it is to be noted that due to the proximate positioning of loop members 39 adjacent pivot pin assemblies 37, when bar 36 is swung away from the filter roll path, the longitudinal axes of springs 38 shift over the pivot axes 37 to urge hold-down bar 3.6 away from the filter roll path through the openings.

As can be seen particularly in FIGURE 6 of the drawings, a stop means 42 is pivotally mounted on housing 2 intermediate the openings to hold hold-down bar 36 in in termediate position out of the path of at least one of the openings when so desired, the stop means engaging with a projecting tip 43 of hold-down bar 36 when the bar is located in such removed position.

The invention claimed is:

1. A filter assembly including a housing having filter medium storage sections at opposite ends thereof and a flow-through gas treating section intermediate said stor age sections with at least one of said sections serving as a roll storage section receiving and supporting a roll of filter material wound upon a mandrel having projecting spindles; an improved construction of said roll storage section of said housing comprising: a pair of spaced, oppositely disposed end walls; at least two side walls extending between said end walls, the inner faces of said side walls being in spaced relation from each other to define with said end walls a roll support zone therebetween, each of said side walls being individually pivotally mounted to said housing to provide upon pivotal movement of both of said side walls away from said roll support zone two roll insertion openings providing alternative roll insertion paths through which said roll of filter material wound upon a mandrel having projecting spindles can be selectively inserted; roll support bearing means mounted on said opposed end walls receiving and supporting said spindle therebetween when said roll is in operative position; filter roll manipulating means pivotably mounted to said housing in said roll support zone at a preselected position to be selectively removable from either of said roll insertion path through either of said openings during filter roll loading operations; and spring means connected to said filter roll manipulating means to urge said manipulating means into abutting engagement against said filter roll when said roll has been inserted int-o operative position in said roll support zone through one of said openings, said spring means including a longitudinally extending spring member, one end of which is fixed to said housing and the other to said manipulating means; and means to permit the longitudinal axis of said spring to shift over the pivot axis of said manipulating means to urge said manipulating means away from said openings.

2. The apparatus of claim 1, said filter roll manipulating means being of sufficient length to extend through the last of said roll openings from which said manipulating means can be pivotally removed to be actuated toward abutting engagement against said filter roll when said side wall for said opening is moved to closed position.

3. The apparatus of claim 1, said filter roll manipulating means com-prising: a hinge assembly including two hinge plates and a pintle about which said plates are pivotally mounted relative each other with one of said plates being fastened to said housing at a preselected position so that the other of said plates can be pivotally re,- moved from alignment with either of said roll insertion openings; a media run-out switch positioned in said housing in cooperable alignment with said pivotal plate of said hinge assembly; a media run-out switch arm fastened at one end thereof in cantilever fashion to said pivotal plate of said hinge assembly, said arm being of sufiicient length to extend through the last of said roll openings from which said arm can be removed to be actuated toward abutting engagement against said filter roll when said side wall for said opening is moved to closed position; said spring means comprising a coil spring and said other end is fastened to said pivotal plate of said hinge assembly at preselected positions so that the longitudinal axis of said coil spring can shift over the axis of said pintle to urge said arm toward said roll when on one side of said axis and away from said roll when on the other.

4. The apparatus of claim 1, said filter roll manipulating means comprising: a roll hold-down bar pivotally mounted to said housing at a position to be pivotally removable from said openings; said hold down bar having a loop member fixed thereto adjacent said pivot axis; said spring means comprising a coil spring, and said other end of said spring being slidably fastened to said loop member of said hold down bar so that the longitudinal axis of said coil spring can shift over the pivot axis of said hold down bar to urge said bar toward said roll when on one side of said axis and away from said roll when on the other.

References Cited UNITED STATES PATENTS 214,169 4/1879 Merrill. 1,152,446 9/ 1915- Spencer. 1,542,808 6/1925 Adams 200-6116 X 2,144,670 1/1939 Wachsman 2'006l.13

(Other references on following page) UNITED STATES PATENTS FOREIGN PATENTS 850,488 10/ 1960 Great Britain.

Berley et a1. 16-72 Orphan 20061.21 Palmer 55*290 X OTHER REFERENCES Carbary 1-6-72 X 5 Myer 16 190 X Cambndge Bulletm 113, Cambndge Fllter Corporauon,

7645 Seventh North Road, Syracuse, N.Y., 13201, copy- Gerber et a1. 55 354 Gregory et a1 55352 fight 1964 8 Pages- Hicks et a1. 312-310 X Sharpe 312-319 X m HARRY B. THORNTON, Primary Examiner.

5 4 gf i fiz j 3 D. TALBERT, Assistant Examiner. 

1. A FILTER ASSEMBLY INCLUDING A HOUSING HAVING FILTER MEDIUM STORAGE SECTIONS AT OPPOSITE ENDS THEREOF AND A FLOW-THROUGH GAS TREATING SECTION INTERMEDIATE SAID STORAGE SECTIONS WITH AT LEAST ONE OF SAID SECTIONS SERVING AS A ROLL STORAGE RECEIVING AND SUPPORTING A ROLL OF FILTER MATERIAL WOUND UPON A MANDREL HAVING PROJECTING SPINDLES; AN IMPROVED CONSTRUCTION OF SAID ROLL STORAGE SECTION OF SAID HOUSING COMPRISING: A PAIR OF SPACED, OPPOSITELY DISPOSED END WALLS; AT LEAST TWO SIDE WALLS EXTENDING BETWEEN SAID END WALLS, THE INNER FACES OF SAID SIDE WALLS BEING IN SPACED RELATION FROM EACH OTHER TO DEFINE WITH SAID END WALLS A ROLL SUPPORT ZONE THEREBETWEEN, EACH OF SAID SIDE WALLS BEING INDIVIDUALLY PIVOTALLY MOUNTED TO SAID HOUSING TO PROVIDE UPON PIVOTAL MOVEMENT OF BOTH SAID SIDE WALLS AWAY FROM SAID ROLL SUPPORT ZONE TWO ROLL INSERTION OPENINGS PROVIDING ALTERNATIVE ROLL INSERTION PATHS THROUGH WHICH SAID ROLL OF FILTER MATERIAL WOUND UPON A MANDREL HAVING PROJECTING SPINDLES CAN BE SELECTIVELY INSERTED; ROLL SUPPORT BEARING MEANS MOUNTED ON SAID OPPOSED END WALLS RECEIVING AND SUPPORTING SAID SPINDLE THEREBETWEEN WHEN SAID ROLL IS IN 